---Hello, this is Mike. Is Dr. Li in?
---Sorry, he_________ to the west of Africa to help the patients there.
A.has been B. is going C. has gone
—Where did you go _____ vacation?—I went to Hong Kong.
A. for B. in C. on
—_______does he go shopping? — Twice a week.
A. How often B. How C. How long
There will be _____ jobs for people in the future, because more robots will do the same jobs as people.
A. many B. less C. fewer
Why not ______ the old women? They need us.
| A．help | B．helping | C．to help | D．helped |
Sarah always makes her son _______ his hands before eating.
| A．wash | B．washing | C．to wash | D．washes |